Dry battery cell



H. M. KORETZKY Feb, 17. 1925.

' -Fled March 4, 1922 35 ing washer is used at the bottom ofthe` Patented Feb. I17.,

' isa spec'ification fThe present-inventienfhas relation to an HARRY M. Kon-ETZKY, or univ vomi', n. Y.

i DRY BATTERY' entr...

Application filed March 4, 1922. .Seriali-No. 541,016.`

To all whom t may concern."

.Be'itknown that I, HARRY M. Konnrzny, a citizen of the United States, residing in New York, county andv State O f New York, have invented `a certain- Improvement in ADry Battery'Cells, of which lthe following improved form of dry battery cell, and to the process of making the same.

The standard type lof dry cells-now in use comp-rises an external zinc cup forming one electrode, in vcombinatioi'iwith a central carbon electrode within-a thick en# velope of. depolarizing mixture constituting a core, and an electrolyte occupying the space between this core and the cup. The upper lportion of the cup is generally filled withl an insulating Ysealing compound. The composition of the electrolyte and of the depolarizing mixture varies greatly in different ymakes of battery, and a. varietyo-f. details of construction have been introduced in the cell design, but the elements above named are generally adopted' in common by. all makers of dry cells.

In forming the core, vsome makers have used a cloth tied around the relatively loose depolarizing'mass," to secureit to the central carbon rod, while others have used a dip v for the ent'necorepreferably of a so-called ,-bibulous Anaterial. A ing serves. to hold the depolarizing. massl This dip von harden'- together and consolidate the core. 'In all of these'former constructions, an insulatit in an axial position within the cup, so asI to leave a space of substantially uniform width all around the'core to accommodate the electrolyte. vIt is also common practicev to dip the'porous carbon rod in paraffin beforeincorporating it in the core.

My present invention provides a simpler,

. cheaper and more eifective'construction than has beenhiithert'o adopted", and my improved l rprocess of manufacture accomplishes a disprevents the Jformation of bubbles. in thev eleetrolytic paste, which are liable to form .up the cells. 'Also by usin where the cores are stored before maki the freshy made cores, the electrolyte 'o not so i into the core, thus preserving the strength of the electrolyte and improving the battery. My cell has vthe further advantage that the core surface is bare, thusobtaining per-l fect contact between the core and the electrolvte and diminishing internal resistance. By leaving the carbon unparafiined over that part of 4it with which the depolarizing mixture is in Contact, the deleterious insulating effect of the parafiin is'done away with` while I get' the advantages of the paraffin coating 'on the exposed upper part of the carbon. y

- My improved I.onstruction also has the advantage that t e core is automatically centred when' inserted in a zinc cup'. no

'extraneous parts being necessary to hold it rapid, simple and certain process of manufacture as set forth hereinafter. The invention is illustrated by Way of example in the accompanying drawings wherein Figure 1 is a median vertical sec- 80 tion of a cell partly completed, Figure 2 is a similar view of the core in modified form, and Figure 3 is a horizontal section on the line 3-3 in Figure 2. In building up my core I take a carbon rod 10, free from parafiimof the right length and diameter and mold around it in any well lniown manner the body of depolarizer 11. vrIhis may have any appropri atecomposition. 9

The partly completed core is then dipped, first at one end and then at the .other in a'bath ofa quick hardening magma. suchI as melted paraffin. The invention is not limited to this` substance. however, as cerasin,sealing1 wax, strong glue or even a strong paste might be used. The result of these clippings is that the upper portion of the carbon rod, as well as the entire top and a portion of the upper periphery of the l" core is provided with an adherent electrically neutral ea.p l 2; while a similar cap 13 covers the bottom and a part of the lower periphery of the core. More or less of this .covering will, of course, be removed from' the end of the carbon, to make proper electrical contact with the usual metallic terminal cap. In the drawingthe flat end of the carbon is thus shown baredl The end `caps 12 and 13 thus/formed serve 110 to support and consolidate the core, so that S it can be handled as a unit with impunity in the course of manufacture. These caps have an additional function'whichv is very important. By making the layer lof-paraffin o'r` the like suiciently thick, rims 14 land 15 are provided at the top and bottom of the corewhich lit tightly within the,zinc cup 16, when the cell is assembled, thus automatically centring the corewhen it lis inserted. The electrolytic fluid or paste (cooked -or cold as the case may be) occupies .the space 17 between the rims 14 and 15;y

.Owing to the fact that the cap 13 covers the bottom of the core. as shown, this bottom-is e'ectually insulated from the zinc cup, and the insertio-n of the usual insulating washer is rendered unnecessary.

Figures 2 and El show a modification in which the security' of the depolarizingma.- terial is further insured by applying a layer of bibulous material such; as a piece of thin cloth 18 around the core just before dipping. No attachment other than .the

massenv the invention, it is shownand described to make it clear that the scope of the invention is not limited to the use of a bare core.

What vis claimed iss- 1. In a battery cell, a core comprising a carbon electrode, a body of depolarizing mixture surrounding the greater portion of y said electrode, and a shell of electrically neutral magma hardened around the upper.

and projecting part ofthe carbon electrode and the adjacent portion of the depolarizing body, and adapted to lfortify attachment of said body to said electrode.

2. ln a battery cell, a core as in claim l hereof wherein /a shell of hardened magma is alsolvapplied to the lower end of the core.

In testimony whereof I have hereto set` i my hand on this 1st day of March, 1922.

- HARRYM. KORETZKY. 

